Number 4 (rotated)

Threads of white, black, yellow, red, and green scatter across a rich brown surface in this 1950 work by Jackson Pollock. Rather than standing at an easel, Pollock spread his canvas on the floor and worked from every side, flinging and pouring paint from above until the whole surface buzzed with tangled lines. Nothing pulls your gaze to one spot. The eye just keeps roaming, chasing loops and splatters, which was exactly what Pollock wanted.

As a major voice in Abstract Expressionism, the movement that took off in New York after World War II, Pollock stirred up plenty of debate. Some hailed him as a genius, others dismissed the drips as a mess, and critics even nicknamed him "Jack the Dripper." Behind the apparent chaos, though, sat real skill. He understood how thick to make the paint, how quickly to move, and roughly where each splash would fall, giving these paintings a hidden rhythm that feels almost musical.

One quirky detail sets this piece apart: it hangs rotated from how it was first painted. Since abstract works often have no obvious top or bottom, flipping the canvas simply hands you a new way to read all those energetic swirls.